I am experiencing the same problem. It doesn't matter wich browser I use: MS Explorer, Firefox, Konqueror.It alao doesn't matter if the cookies are deleted or not.Sometimes a tread is marked, when I have posted a message. But not if someone else makes a post.

Ok I have made a HUGE cookie change (which is why everyuser has been forced to re-login) ... let me know if the problem still exists (this is an attempted fix but in no way will it fix all of the cookie problems, that is still being worked on).

I deleted my cookies, restarted my computer and I still have the problem. The only way I see the new posts is when I click on the last posted to the right and view it in threaded mode. I prefer flat mode and they used to show up highlighted as new before the latest change. Hope this sheds some light to the problem.